This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125BX200, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125BX200
The AirTAC SI125 Standard Cylinder SI125BX200 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125BX200, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125BX200
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI125 Standard Cylinder SI125BX200
The AirTAC SI125BX200 is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 200mm stroke. It delivers 6136N push and 5734N pull at 0.5MPa, peaking at 1251kgf. The direct replacement is the SAI125BX200, matching the G1/2 port, M27x2 thread, and ISO 15552 mounting interface. Note this SKU lacks a magnet (-S), so it cannot accept a CS1-B/DS1-B sensor.
The SAI125BX200 upgrades the piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -B variant uses a SUS304 stainless steel rod for corrosion resistance instead of carbon steel. The cushion only decelerates; use SAIL or BSAI lock variants for load holding.
Airtac SI125 Standard Cylinder SI125BX200 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125BX200 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125BX200 |
| Bore size | Ø125 mm |
| Stroke | 200 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125BX200 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAI125BX200 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125BX200
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×200 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125BX200 Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring high thrust, using the 6136N push force at 0.5MPa to form thick metal components reliably.
Automated Clamp Fixture
Secures large automotive or industrial parts during machining, relying on the 125mm bore's 1251kgf maximum theoretical force for rigid holding.
Replacing the Airtac SI125 Standard Cylinder SI125BX200 with the SAI125BX200
To replace the SI125BX200, order the SAI125BX200. Confirm the ISO 15552 mounting interface, 125mm bore, 200mm stroke, G1/2 port, and your specific mounting accessory (LB, FA, TC, etc.). Because this SKU has no -S magnet, it cannot support position sensing; if sensing is needed, order an SAI125X200S and use current AirTAC switches. Sizing both ways: the 125mm bore yields 6136N push at 0.5MPa; dropping to an 80mm bore gives 2513N. For load holding on air loss, a plain cylinder drifts—use an external pilot check valve or the SAIL/BSAI lock variant. At 200mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125BX200
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125BX200 FAQ
Yes, the SI125BX200 is discontinued. The direct replacement is the SAI125BX200. It is dimensionally interchangeable per ISO 15552, keeping the same 125mm bore, 200mm stroke, G1/2 port, and mounting interface, but features an upgraded piston seal.
The 125mm bore features a G1/2 air port and M27x2 rod thread. Force output is 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N push at 0.9MPa, and a theoretical maximum of 1251kgf at 1.0MPa. Operating speed is 30-500mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125BX200
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125BX200 replacement — usually within 7-8 hours.